\documentclass[11pt,openright]{book}
\usepackage{array}
\newcolumntype{C}{>{\centering\arraybackslash}X}
\renewcommand{\arraystretch}{1.2}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{caption}

\begin{document}

\begin{scriptsize}

\input{Yhat.tex}
\end{scriptsize}





\end{document}